//
//  CZMainTabBar.swift
//  GZWeiboMing
//
//  Created by 1 on 16/3/22.
//  Copyright © 2016年 1. All rights reserved.
//

import UIKit

let TabBarItemCount = 5

class CZMainTabBar: UITabBar {
    
    override func layoutSubviews() {
        super.layoutSubviews()
        print("CZMainTabBar: layoutSubview")
        
        //计算item的宽度
        let width = frame.width / CGFloat(TabBarItemCount)
        //计算最左边的这个frame，后面使用CGRectOffset
        let originFrame = CGRect(x: 0, y: 0, width: width, height: frame.height)
        
        var index = 0
        for view in subviews {
            let cls = NSClassFromString("UITabBarButton")
            if view.isKindOfClass(cls!) {
                view.frame = CGRectOffset(originFrame, CGFloat(index) * width, 0)
                index += index == 1 ? 2 :1
            }
        }
        //设置加号按钮frame
        composeButton.frame = CGRect(x: 2 * width, y: 0, width: width, height: frame.height)
    }
    
    //MARK: - 懒加载
    //加号按钮
    private lazy var composeButton: UIButton = {
       let button = UIButton()
        //设置
        button.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: UIControlState.Normal)
        button.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: UIControlState.Highlighted)
        
        button.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: UIControlState.Normal)
        button.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)
        
        // 添加到tabBar上面
        self.addSubview(button)
        
        return button
    }()

}
